How to change username?

Hi, I recently found that my username for sync has an additional “" mark. The username which I was intended to use is "gejianxin" and now the actual username I use is "gejianxin”.
Any ideas how to fix this?

Has this been resolved? If not I would suggest pinging @ Ramses or @ Tienson either on here or the Discord to get it resolved

It seems username remain the same.
I use “gejianxin” to login encounters an error.
The old username can still login.